Comparison of two different cell topologies for a multilevel power supply to achieve high efficiency envelope amplifier

Díaz, Daniel; Vasić, Miroslav; Alou, P.; García, O.; Oliver, J. A.; Cobos, J.A.

doi:10.1109/ecce.2009.5316186

Cited by 9 publications

(10 citation statements)

References 16 publications

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“…The switched regulator can be implemented in many different ways [18]. It operates in openloop and its output will be only certain discrete voltage levels.…”

Section: -Voltage Waveform At the Input Of The Linear Rectifier And Omentioning

confidence: 99%

An overview of fast DC-DC converters for envelope amplifier in RF transmitters

Garcia

Vasić

Alou

et al. 2012

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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ABSTRACT. In the last years, RF power amplifiers are taking advantage of the switched dc-dc converters to use them in several architectures that may improve the efficiency of the amplifier, keeping a good linearity. The use of linearization techniques such as Envelope Elimination and Restoration (EER) and Envelope Tracking (ET) requires a very fast dc-dc power converter to provide variable voltage supply to the power amplifier but theoretically the efficiency can be much higher than using the classical amplifiers belonging to classes A, B or AB.The purpose of this paper is to analyze the state of the art of the power converters used as envelope amplifiers in this application where a fast output voltage variation is required. The power topologies will be explored and several important parameters such as efficiency, bandwidth and output voltage range will be discussed.

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“…The switched regulator can be implemented in many different ways [18]. It operates in openloop and its output will be only certain discrete voltage levels.…”

Section: -Voltage Waveform At the Input Of The Linear Rectifier And Omentioning

confidence: 99%

An overview of fast DC-DC converters for envelope amplifier in RF transmitters

Garcia

Vasić

Alou

et al. 2012

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…The switched regulator can be implemented in many different ways [25,26] (Figure 3 shows just one possible way how to do it). The multilevel converter operates in open-loop and its output will be only certain discrete voltage levels.…”

Section: E Multilevel Converter In Series With a Linear Regulatormentioning

confidence: 99%

“…In [23] a flyback converter with three outputs has been used. In [25] a bidirectional flyback in a combination with a buck converter was implemented as a first stage, while in [26] the first stage is composed of simple voltage dividers implemented with switched capacitors. The last example offers very high efficiency and power density of the first stage and it does not need any bulky magnetic component, which opens a possibility for the integration of this stage.…”

Section: E Multilevel Converter In Series With a Linear Regulatormentioning

confidence: 99%

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Survey of architectures and optimizations for wide bandwidth envelope amplifier

Vasić

García

Oliver

et al. 2012

2012 15th International Power Electronics and Motion Control Conference (EPE/PEMC)

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-In the last years, RF power amplifiers are taking advantage of the switched dc-dc converters to use them in several architectures that may improve the efficiency of the amplifier, keeping a good linearity. The use of linearization techniques such as Envelope Elimination and Restoration (EER) and Envelope Tracking (ET) requires a very fast dc-dc power converter to provide variable voltage supply to the power amplifier but theoretically the efficiency can be much higher than using the classical amplifiers belonging to classes A, B or AB. The purpose of this paper is to analyze the state of the art of the power converters used as envelope amplifiers in this application. The power topologies will be explored and several important parameters such as efficiency, bandwidth will be discussed.

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“…ET power supply is a voltage source, so type I and type III can be considered. The type I connection was analyzed and modeled in [12] and [13]. In such a connection, the power transistors of the linear amplifier need to handle full load current.…”

Section: Introductionmentioning

confidence: 99%

Feed-Forwarding the Output Voltage to Improve Efficiency for Envelope-Tracking Power Supply Based on a Switch-Linear Hybrid Scheme

Xiong

Ruan

et al. 2011

IEEE Trans. Power Electron.

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Envelope-tracking (ET) technique is one of the most promising methods to improve the efficiency of the modern wireless communication transmitters, which is based on using a highefficient power supply to provide varying voltage to the RF power amplifier. For this application, this letter adopts an AB-type linear amplifier and a synchronous rectification buck converter connected in parallel at the output to construct the ET power supply. The linear amplifier features of wide bandwidth and makes the output voltage follow the envelope of the transmitted signal; the buck converter features of high efficiency provides most of the load current. An average current control strategy with constant switching frequency is proposed, and it is further improved by feed-forwarding the output voltage to reduce the current of the linear amplifier, leading to higher efficiency. A prototype is built and shown to perform very well, achieving high efficiency and track bandwidth of about 100 kHz.Index Terms-AB-type linear amplifier, buck converter, current control strategy, envelope-tracking (ET) technique.

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Comparison of two different cell topologies for a multilevel power supply to achieve high efficiency envelope amplifier

Cited by 9 publications

References 16 publications

An overview of fast DC-DC converters for envelope amplifier in RF transmitters

An overview of fast DC-DC converters for envelope amplifier in RF transmitters

Survey of architectures and optimizations for wide bandwidth envelope amplifier

Feed-Forwarding the Output Voltage to Improve Efficiency for Envelope-Tracking Power Supply Based on a Switch-Linear Hybrid Scheme

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